package com.itheima.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.itheima.common.BaseContext;
import com.itheima.common.R;
import com.itheima.dao.ShoppingCart;
import com.itheima.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.time.LocalDateTime;
import java.util.List;


/**
 * 购物车
 * */
@Slf4j
@RestController
@RequestMapping("/shoppingCart")
public class ShoppingCartController {

    @Autowired
    private ShoppingCartService shoppingCartService;

    /**
     * 添加购物车
     * */
    @PostMapping("add")
    public R<ShoppingCart> add(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据:{}",shoppingCart);

        //设置用户id，指定当前是哪个用户的购物车数据
        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        //查询当前菜品或者套餐是否在购物车中
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,currentId);
        if (dishId != null){
            //添加到购物车时菜品
            lambdaQueryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {
            //添加到购物车时套餐
            lambdaQueryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        ShoppingCart cartServiceOne = shoppingCartService.getOne(lambdaQueryWrapper);

        if (cartServiceOne != null) {
            //如果已经存在，就在原来数量基础上加一
            Integer number = cartServiceOne.getNumber();
            cartServiceOne.setNumber(number+1);
            shoppingCartService.updateById(cartServiceOne);
        }else {
            //如果不存在，则添加到购物车，数量默认就是一
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartService.save(shoppingCart);
            cartServiceOne=shoppingCart;
        }
        return R.success(cartServiceOne);
    }

    /**
     * 查看购物车
     * */
    @GetMapping("/list")
    public R<List<ShoppingCart>> list(){
        log.info("查看购物车...");
        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());
        lambdaQueryWrapper.orderByDesc(ShoppingCart::getCreateTime);

        List<ShoppingCart> list = shoppingCartService.list(lambdaQueryWrapper);


        return R.success(list);
    }

    //
    @PostMapping("/sub")
    public R<ShoppingCart> sub(@RequestBody ShoppingCart shoppingCart){
        log.info("购物车数据02:{}",shoppingCart);

        Long currentId = BaseContext.getCurrentId();
        shoppingCart.setUserId(currentId);
        Long dishId = shoppingCart.getDishId();
        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,currentId);
        if (dishId != null){
            //添加到购物车时菜品
            lambdaQueryWrapper.eq(ShoppingCart::getDishId,dishId);
        }else {
            //添加到购物车时套餐
            lambdaQueryWrapper.eq(ShoppingCart::getSetmealId,shoppingCart.getSetmealId());
        }
        ShoppingCart cartServiceOne = shoppingCartService.getOne(lambdaQueryWrapper);
        if (cartServiceOne != null) {
            //如果已经存在，就在原来数量基础上加一
            Integer number = cartServiceOne.getNumber();
            if (number == 1){
                shoppingCartService.removeById(cartServiceOne.getId());
            }else {
            cartServiceOne.setNumber(number-1);}
            shoppingCartService.updateById(cartServiceOne);
        }else {
            //如果不存在
            return R.error("不存在");
        }
        return R.success(cartServiceOne);
    }

    /**
     * 清空购物车
     * */
    @DeleteMapping("/clean")
    public R<String> clean(){

        LambdaQueryWrapper<ShoppingCart> lambdaQueryWrapper = new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(ShoppingCart::getUserId,BaseContext.getCurrentId());

        shoppingCartService.remove(lambdaQueryWrapper);
        return R.success("清空购物车");
    }
}
